How to pass parameter to path in url_for FastAPI?
Question
I am an absolute newbie to FastAPI and faced a pretty strange problem. While trying to display an image by its name (which is the same as id), I just cannot pass the name to the template. To make it clear, everything works fine if I just hardcode the id, but the question is how to pass it automatically? Here is my main.py:
from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")
@app.get("/items/{id}", response_class=HTMLResponse)
async def read_item(request: Request, id: str):
return templates.TemplateResponse("item.html", {"request": request, "id": id})
And here is my template.
<html>
<head>
<title>Item Details</title>
<link href="{{ url_for('static', path='/css/styles.css') }}" rel="stylesheet">
</head>
<body>
<h1>Item ID: {{ id }}</h1>
<img src="{{ url_for('static', path='/qr-codes/{{ id }}.png') }}"/>
</body>
</html>
But this line: <img src="{{ url_for('static', path='/qr-codes/{{ id }}.png') }}"/> doesn't work as {{ id }} isn't seen as a parameter.
So my question is how can I pass my parameter to path in url_for? Thanks for every responce!
1 answers
solution1
1 ACCPTED 2022-12-11 01:56:41
In item.html, change the img src path value to the below:
<img src="{{ url_for('static', path='/qr-codes/'+ id + '.png') }}" />
Request URL:
http://localhost:8000/items/1
OpenApi (Swagger) Output
<h1>Item ID: 1</h1>
<img src="http://localhost:8000/static/qr-codes/1.png" />
Note: Concatenate the string using '+' gives the formatted value
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